几种典型车辆在斜拉桥桥面行驶的临界风速研究

Critical wind velocities for several kinds of typical vehicle running on a cable-stayed bridge deck

研究强侧风作用下三种典型汽车在斜拉桥桥面行驶时的临界风速和车速。分析汽车运动方程的随动坐标特性和桥梁的侧向抖振对汽车相对桥面侧偏的影响,得到侧偏位移及速率的计算式,在以往基础上,研究了考虑车辆侧偏和驾驶员行为的风-车-桥空间耦合振动系统,完善了仿真分析程序的功能。以某斜拉桥为实例,分析三种典型车辆在桥面行使的临界风速。分析结果表明:采用控制重心还是前轮侧滑的驾驶员模型不显著影响桥面汽车临界风速的大小;不同类型汽车的事故原因可能不同,对于箱式货车,侧滑事故起控制作用,对于桑塔纳和一汽佳宝,车速高时,侧倾事故起控制作用,低车速时,侧滑事故起控制作用。

The critical wind velocity and running velocity were studied for three kinds of typical vehicle running on a cable-stayed bridge deck under action of strong side wind.The effects of the bridge＇s side buffeting and the following coordinate features of the vehicle＇s moving equations on the vehicle side deviation relative to the bridge deck were analyzed,the calculation formulas of its relative side slipping and velocity were obtained.Based on previous studies,a wind-vehicle-bridge coupling vibration system including vehicle side deviation and driver＇s behavior was studied,and the corresponding simulation code was improved and tested.A cable-stayed bridge was taken as an example,critical wind velocities of three kinds of typical automobile running on the bridge deck were obtained.Results showed that the critical wind velocity is not significantly influenced by controlling objectives of driver behavior;the accident types of different vehicles are possibly different;for box-type truck,its critical wind velocity of side slipping is always lower than that of overturning;but for cars like Santana and Jia-bao,overturning accident plays a controlling role when running velocity is high,while side slipping accident does when running velocity is low.